There is a dizzying array of drinks, gels, and bars that promise to boost your energy or recovery. But many of those products are laden with calories and fats that most people don't need for most of their workouts. Some bars have calorie, fat, and sugar stats that are higher than candy bars. And they're really designed to refuel you if you're working out for 90 minutes or longer. Unless you are using a well-balanced bar as a meal replacement, these options are not ideal for weight loss. They won't keep you full for long, making it likely you'll overeat at your next meal.